From: Jason Ish <jason.ish@oisf.net>
Date: Tue, 21 Dec 2021 22:59:24 +0000 (-0600)
Subject: dns-z-bit: test dns z-bit alert and logging
X-Git-Tag: suricata-6.0.5~46
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8908cc63e70556c4b50489dbc6f768efeb8eafa2;p=thirdparty%2Fsuricata-verify.git

dns-z-bit: test dns z-bit alert and logging

Tickets: 4515, 4924
---

diff --git a/tests/dns-z-bit/dns-events.rules b/tests/dns-z-bit/dns-events.rules
new file mode 100644
index 000000000..0e34dae13
--- /dev/null
+++ b/tests/dns-z-bit/dns-events.rules
@@ -0,0 +1,9 @@
+# Malformed data in request. Malformed means length fields are wrong, etc.
+alert dns any any -> any any (msg:"SURICATA DNS malformed request data"; flow:to_server; app-layer-event:dns.malformed_data; classtype:protocol-command-decode; sid:2240002; rev:2;)
+alert dns any any -> any any (msg:"SURICATA DNS malformed response data"; flow:to_client; app-layer-event:dns.malformed_data; classtype:protocol-command-decode; sid:2240003; rev:2;)
+# Response flag set on to_server packet
+alert dns any any -> any any (msg:"SURICATA DNS Not a request"; flow:to_server; app-layer-event:dns.not_a_request; classtype:protocol-command-decode; sid:2240004; rev:2;)
+# Response flag not set on to_client packet
+alert dns any any -> any any (msg:"SURICATA DNS Not a response"; flow:to_client; app-layer-event:dns.not_a_response; classtype:protocol-command-decode; sid:2240005; rev:2;)
+# Z flag (reserved) not 0
+alert dns any any -> any any (msg:"SURICATA DNS Z flag set"; app-layer-event:dns.z_flag_set; classtype:protocol-command-decode; sid:2240006; rev:2;)
diff --git a/tests/dns-z-bit/input.pcap b/tests/dns-z-bit/input.pcap
new file mode 100644
index 000000000..b9fe2f5fd
Binary files /dev/null and b/tests/dns-z-bit/input.pcap differ
diff --git a/tests/dns-z-bit/test.yaml b/tests/dns-z-bit/test.yaml
new file mode 100644
index 000000000..bc7ce3771
--- /dev/null
+++ b/tests/dns-z-bit/test.yaml
@@ -0,0 +1,62 @@
+requires:
+  min-version: 7.0
+
+args:
+- -k none
+
+checks:
+- filter:
+    count: 1
+    match:
+      event_type: dns
+      dns.type: query
+      dns.z: true
+- filter:
+    count: 1
+    match:
+      event_type: alert
+      alert.signature_id: 2240006
+      dns.query[0].z: true
+- filter:
+    count: 1
+    match:
+      dest_ip: 8.8.8.8
+      dest_port: 53
+      dns.answers[0].rdata: 142.251.32.68
+      dns.answers[0].rrname: www.google.com
+      dns.answers[0].rrtype: A
+      dns.answers[0].ttl: 58
+      dns.flags: '8180'
+      dns.grouped.A[0]: 142.251.32.68
+      dns.id: 1
+      dns.qr: true
+      dns.ra: true
+      dns.rcode: NOERROR
+      dns.rd: true
+      dns.rrname: www.google.com
+      dns.rrtype: A
+      dns.type: answer
+      dns.version: 2
+      event_type: dns
+      pcap_cnt: 2
+      proto: UDP
+      src_ip: 10.16.1.11
+      src_port: 42150
+- filter:
+    count: 1
+    match:
+      app_proto: dns
+      dest_ip: 8.8.8.8
+      dest_port: 53
+      event_type: flow
+      flow.age: 0
+      flow.alerted: true
+      flow.bytes_toclient: 90
+      flow.bytes_toserver: 74
+      flow.pkts_toclient: 1
+      flow.pkts_toserver: 1
+      flow.reason: shutdown
+      flow.state: established
+      proto: UDP
+      src_ip: 10.16.1.11
+      src_port: 42150